To find out how fast a tree grows, you can measure its trunk. a giant red oak's diameter was 248 inches in 1965. the tree's diameter had grown to 251 inches in 2005. find the average rate of change in the diameter of the tree per year.

To find the rate of change you will want to know the independent and dependent variables. The independent variable is x and the dependent y. In this case the year that the diameter of the tree is measured is the independent variable. The equation to find the rate of change is y2-y1/x2-x1. You will want to have 2005 as y2 and 1965 as y1 because 2005 was the second time the diameter was measured. 251 would be x2 and 248 would be x1. once you substitute the numbers in you will find your rate of change. HOPE THIS WAS HELPFUL

Ibelieve it is 5,040